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Sung Hwa Jhung - One of the best experts on this subject based on the ideXlab platform.
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ionic Liquid mil 101 prepared via the ship in bottle technique remarkable adsorbents for the removal of benzothiophene from Liquid fuel
Chemical Communications, 2016Co-Authors: Nazmul Abedin Khan, Zubair Hasan, Sung Hwa JhungAbstract:Ionic Liquids (ILs) were synthesized inside a porous metal–organic framework (MIL-101) via a ship-in-bottle (SIB) technique. Unlike previously reported IL-incorporated MIL-101s, IL@MIL-101 prepared by the SIB approach was very stable over several cycles for the Liquid Phase Adsorption of benzothiophene from Liquid fuel.
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Liquid Phase Adsorption of aromatics over a metal organic framework and activated carbon effects of hydrophobicity hydrophilicity of adsorbents and solvent polarity
Journal of Physical Chemistry C, 2015Co-Authors: Biswa Nath Bhadra, Nazmul Abedin Khan, Kyung Ho Cho, Doyoung Hong, Sung Hwa JhungAbstract:In order to understand the effect of solvent polarity and hydrophilicity/hydrophobicity of adsorbents on Adsorption, aromatic compounds with very low acidity or basicity were adsorbed over two highly porous adsorbents, a metal–organic framework (MOF, MIL-101) and activated carbon (AC). Thiophene, pyrrole, and nitrobenzene were tested in Liquid-Phase Adsorptions to estimate possible applications of the adsorbents in adsorptive desulfurization (ADS), adsorptive denitrogenation (ADN), and water purification, respectively. MIL-101 adsorbed the three adsorbates more effectively with decreasing solvent polarity, and AC with increasing solvent polarity. This behavior can be explained by the hydrophilicity of MIL-101 and hydrophobicity of AC, which was confirmed by measuring the hydrophobicity indexes. The preferential Adsorptions of the adsorbates over MOF might be explained by polar interactions and AC by hydrophobic interactions. Moreover, it can be concluded that MOFs, especially hydrophilic ones, can be effe...
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effect of central metal ions of analogous metal organic frameworks on the adsorptive removal of benzothiophene from a model fuel
Journal of Hazardous Materials, 2013Co-Authors: Nazmul Abedin Khan, Sung Hwa JhungAbstract:Liquid Phase Adsorption of benzothiophene (BT) has been studied over CuCl₂-loaded analogous metal-organic frameworks (MOFs), metal-benzenedicarboxylates (Me-BDCs, Me: Al, Cr and V), to understand the effect of central metal ions on the adsorptive removal of BT from a model fuel. Among the central metal ions (Al(3+), Cr(3+) and V(3+)) of the Me-BDCs only V(3+) was oxidized by the loaded CuCl₂ (or Cu(2+)) at ambient condition resulting in V(4+) and Cu(+) species. Different from the CuCl₂-loaded Al- and Cr-BDCs, the CuCl₂/V-BDC adsorbed BT remarkably well compared to the virgin V-BDCs which suggests a specific favorable interaction (π-complexation) between the obtained Cu(+) in the CuCl₂/V-BDC and BT.
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low temperature loading of cu species over porous metal organic frameworks mofs and adsorptive desulfurization with cu loaded mofs
Journal of Hazardous Materials, 2012Co-Authors: Nazmul Abedin Khan, Sung Hwa JhungAbstract:Abstract Porous metal-organic frameworks (MOFs, MIL-100-Fe, iron-benzenetricarboxylate) supported with Cu+ species were obtained for the first time under mild condition without high temperature calcinations. The Cu+-loaded MOFs were evaluated as efficient adsorbents for the Liquid-Phase Adsorption of benzothiophene (BT). The effect of Cu+ loading on the Adsorption kinetics and maximum Adsorption capacity (Q0) for the Adsorption of BT was also studied. Q0 increased with increasing copper loading up to a Cu/Fe (wt./wt.) ratio of 0.07 in Cu+-loaded-MIL-100-Fe, resulting in an increase in the Q0 by 14% compared with the virgin MIL-100-Fe without Cu+ ions. Since the surface area and pore volume decrease with the loading of copper, the increased Q0 over the Cu+-loaded MIL-100-Fe adsorbents suggests specific favorable interactions (probably by π-complexation) between Cu+ and BT.
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adsorptive removal of benzothiophene using porous copper benzenetricarboxylate loaded with phosphotungstic acid
Fuel Processing Technology, 2012Co-Authors: Nazmul Abedin Khan, Sung Hwa JhungAbstract:Liquid-Phase Adsorption of benzothiophene (BT) over phosphotungstic acid (PWA)-loaded porous copper-benzenetricarboxylate (Cu-BTC, one of the porous metal-organic frameworks) has been studied to understand the effect of PWAs on the Adsorption/removal. The maximum Adsorption capacity (Q0) increases with increasing PWA loading up to a W/Cu (wt./wt.) ratio of 0.22 in PWA/Cu-BTCs, resulting in an increase in the Q0 by 26% compared with the virgin Cu-BTC. Since there is no remarkable change in the surface area and pore volume for the virgin and PWA loaded Cu-BTCs, it is suggested that the improved Q0 over PWA/Cu-BTCs is due to the favorable interactions like acid–base ones between the acidic PWA and slightly basic BT. Based on this result, it can be suggested that MOF (metal-organic framework)-type materials, modified suitably, can be used in the adsorptive desulfurization of fuels.
Katsumi Kaneko - One of the best experts on this subject based on the ideXlab platform.
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electron density modification of single wall carbon nanotubes swcnt by Liquid Phase molecular Adsorption of hexaiodobenzene
Materials, 2013Co-Authors: Tomonori Ohba, Sumio Iijima, Katsumi Kaneko, Kenji Hata, Motoo Yumura, Hiroto Komatsu, Akira Sakuma, Hirofumi KanohAbstract:Electron density of single wall carbon nanotubes (SWCNT) is effectively modified by hexaiodobenzene (HIB) molecules using Liquid-Phase Adsorption. UV-Vis-NIR absorption spectra of the HIB-adsorbed SWCNT, especially in the NIR region, showed a disappearance of S11 transitions between the V1 valance band and the C1 conduction band of van Hove singularities which can be attributed to the effective charge transfer between HIB and the SWCNT. The Adsorption of HIB also caused significant peak-shifts (lower frequency shift around 170 cm-1 and higher shift around 186 cm‑1) and an intensity change (around 100-150 cm-1 and 270-290 cm-1) in the radial breathing mode of Raman spectra. The charge transfer from SWCNT to HIB was further confirmed by the change in the C1s peak of X-ray photoelectron spectrum, revealing the oxidation of carbon in SWCNT upon HIB Adsorption.
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Electronically modified single wall carbon nanohorns with iodine Adsorption
Chemical Physics Letters, 2011Co-Authors: Fitri Khoerunnisa, Tomonori Ohba, Toshihiko Fujimori, Hirofumi Kanoh, Tsutomu Itoh, Masako Yudasaka, Sumio Iijima, Katsumi KanekoAbstract:Abstract Tailoring electronic properties of single wall carbon nanohorn (SWCNH) is expected to develop the application potential in various fields. SWCNH is efficiently modified with iodine molecules by Liquid Phase Adsorption. The Adsorption isotherm of iodine on SWCNH was Langmuirian with the saturated Adsorption amount of 185 ± 10 mg g−1 (coverage 0.18), indicating a specific interaction between SWCNH and iodine. The DC electrical conductivity of SWCNH film prepared by dip-coating method increased with the iodine Adsorption amount almost by a factor 10.
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assembly structure control of single wall carbon nanotubes with Liquid Phase naphthalene Adsorption
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007Co-Authors: Suzana Gotovac, Hirofumi Kanoh, Lei Song, Katsumi KanekoAbstract:Naphthalene was adsorbed on single wall carbon nanotubes (SWNT) from trichloroethylene solution. The adsorbed state of naphthalene on dry SWNT samples was studied with X-ray photoelectron spectroscopy and Raman spectroscopy. Adsorption of naphthalene molecules on SWNTs in trichloroethylene provide a uniform coating of external surface of individual SWNTs. Also, a technique of the Liquid Phase Adsorption of naphthalene succeeded to control the assembly structure of the SWNTs, leading to an explicit Adsorption hysteresis in the nitrogen Adsorption isotherm at 77 K.
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effect of nanoscale curvature of single walled carbon nanotubes on Adsorption of polycyclic aromatic hydrocarbons
Nano Letters, 2007Co-Authors: Suzana Gotovac, Hirofumi Kanoh, Hiroaki Honda, Yoshiyuki Hattori, Kunimitsu Takahashi, Katsumi KanekoAbstract:Liquid-Phase Adsorption of tetracene and phenanthrene on a single-walled carbon nanotube (SWCNT) was examined. Tetracene Adsorption was more than six times greater than that of phenanthrene. X-ray photoelectron spectroscopic examination clearly showed that tetracene and phenanthrene molecules efficiently coated the SWCNT external surfaces. The remarkable difference between the Adsorption amounts of tetracene and phenanthrene was caused by the nanoscale curvature effect of the tube surface, resulting in a difference in the amount of contact between the molecule and the tube surface. The Adsorption of tetracene and phenanthrene caused a significant higher frequency shift in the radial breathing mode (RBM) of the Raman band of the SWCNT, indicating an intensive π−π interaction between these polycyclic aromatic hydrocarbons and the external SWCNT surface.
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enhancement of the methylene blue Adsorption rate for ultramicroporous carbon fiber by addition of mesopores
Carbon, 2006Co-Authors: Song Lei, Hirofumi Kanoh, Junichi Miyamoto, Yoshitaka Nakahigashi, Katsumi KanekoAbstract:Abstract Predominant mesopores were added to pitch-based activated carbon fiber (0.7 nm of average pore width) by Ca(NO3)2-impregnated chemical activation. The influence of the concentration of calcium nitrate solution, reactivation temperature and reactivation time on the mesopore development of ACF were examined. The development of mesopores in the reactivated ACF was evidenced by an explicit hysteresis of N2 Adsorption isotherm at 77 K. The pore volume ratio of mesopores to micropores reached to 3–4. The addition of predominant mesopores to ACF enhanced the Liquid Phase Adsorption rate of methylene blue by more than 10 times.
Nazmul Abedin Khan - One of the best experts on this subject based on the ideXlab platform.
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ionic Liquid mil 101 prepared via the ship in bottle technique remarkable adsorbents for the removal of benzothiophene from Liquid fuel
Chemical Communications, 2016Co-Authors: Nazmul Abedin Khan, Zubair Hasan, Sung Hwa JhungAbstract:Ionic Liquids (ILs) were synthesized inside a porous metal–organic framework (MIL-101) via a ship-in-bottle (SIB) technique. Unlike previously reported IL-incorporated MIL-101s, IL@MIL-101 prepared by the SIB approach was very stable over several cycles for the Liquid Phase Adsorption of benzothiophene from Liquid fuel.
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Liquid Phase Adsorption of aromatics over a metal organic framework and activated carbon effects of hydrophobicity hydrophilicity of adsorbents and solvent polarity
Journal of Physical Chemistry C, 2015Co-Authors: Biswa Nath Bhadra, Nazmul Abedin Khan, Kyung Ho Cho, Doyoung Hong, Sung Hwa JhungAbstract:In order to understand the effect of solvent polarity and hydrophilicity/hydrophobicity of adsorbents on Adsorption, aromatic compounds with very low acidity or basicity were adsorbed over two highly porous adsorbents, a metal–organic framework (MOF, MIL-101) and activated carbon (AC). Thiophene, pyrrole, and nitrobenzene were tested in Liquid-Phase Adsorptions to estimate possible applications of the adsorbents in adsorptive desulfurization (ADS), adsorptive denitrogenation (ADN), and water purification, respectively. MIL-101 adsorbed the three adsorbates more effectively with decreasing solvent polarity, and AC with increasing solvent polarity. This behavior can be explained by the hydrophilicity of MIL-101 and hydrophobicity of AC, which was confirmed by measuring the hydrophobicity indexes. The preferential Adsorptions of the adsorbates over MOF might be explained by polar interactions and AC by hydrophobic interactions. Moreover, it can be concluded that MOFs, especially hydrophilic ones, can be effe...
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effect of central metal ions of analogous metal organic frameworks on the adsorptive removal of benzothiophene from a model fuel
Journal of Hazardous Materials, 2013Co-Authors: Nazmul Abedin Khan, Sung Hwa JhungAbstract:Liquid Phase Adsorption of benzothiophene (BT) has been studied over CuCl₂-loaded analogous metal-organic frameworks (MOFs), metal-benzenedicarboxylates (Me-BDCs, Me: Al, Cr and V), to understand the effect of central metal ions on the adsorptive removal of BT from a model fuel. Among the central metal ions (Al(3+), Cr(3+) and V(3+)) of the Me-BDCs only V(3+) was oxidized by the loaded CuCl₂ (or Cu(2+)) at ambient condition resulting in V(4+) and Cu(+) species. Different from the CuCl₂-loaded Al- and Cr-BDCs, the CuCl₂/V-BDC adsorbed BT remarkably well compared to the virgin V-BDCs which suggests a specific favorable interaction (π-complexation) between the obtained Cu(+) in the CuCl₂/V-BDC and BT.
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low temperature loading of cu species over porous metal organic frameworks mofs and adsorptive desulfurization with cu loaded mofs
Journal of Hazardous Materials, 2012Co-Authors: Nazmul Abedin Khan, Sung Hwa JhungAbstract:Abstract Porous metal-organic frameworks (MOFs, MIL-100-Fe, iron-benzenetricarboxylate) supported with Cu+ species were obtained for the first time under mild condition without high temperature calcinations. The Cu+-loaded MOFs were evaluated as efficient adsorbents for the Liquid-Phase Adsorption of benzothiophene (BT). The effect of Cu+ loading on the Adsorption kinetics and maximum Adsorption capacity (Q0) for the Adsorption of BT was also studied. Q0 increased with increasing copper loading up to a Cu/Fe (wt./wt.) ratio of 0.07 in Cu+-loaded-MIL-100-Fe, resulting in an increase in the Q0 by 14% compared with the virgin MIL-100-Fe without Cu+ ions. Since the surface area and pore volume decrease with the loading of copper, the increased Q0 over the Cu+-loaded MIL-100-Fe adsorbents suggests specific favorable interactions (probably by π-complexation) between Cu+ and BT.
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adsorptive removal of benzothiophene using porous copper benzenetricarboxylate loaded with phosphotungstic acid
Fuel Processing Technology, 2012Co-Authors: Nazmul Abedin Khan, Sung Hwa JhungAbstract:Liquid-Phase Adsorption of benzothiophene (BT) over phosphotungstic acid (PWA)-loaded porous copper-benzenetricarboxylate (Cu-BTC, one of the porous metal-organic frameworks) has been studied to understand the effect of PWAs on the Adsorption/removal. The maximum Adsorption capacity (Q0) increases with increasing PWA loading up to a W/Cu (wt./wt.) ratio of 0.22 in PWA/Cu-BTCs, resulting in an increase in the Q0 by 26% compared with the virgin Cu-BTC. Since there is no remarkable change in the surface area and pore volume for the virgin and PWA loaded Cu-BTCs, it is suggested that the improved Q0 over PWA/Cu-BTCs is due to the favorable interactions like acid–base ones between the acidic PWA and slightly basic BT. Based on this result, it can be suggested that MOF (metal-organic framework)-type materials, modified suitably, can be used in the adsorptive desulfurization of fuels.
Hirofumi Kanoh - One of the best experts on this subject based on the ideXlab platform.
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electron density modification of single wall carbon nanotubes swcnt by Liquid Phase molecular Adsorption of hexaiodobenzene
Materials, 2013Co-Authors: Tomonori Ohba, Sumio Iijima, Katsumi Kaneko, Kenji Hata, Motoo Yumura, Hiroto Komatsu, Akira Sakuma, Hirofumi KanohAbstract:Electron density of single wall carbon nanotubes (SWCNT) is effectively modified by hexaiodobenzene (HIB) molecules using Liquid-Phase Adsorption. UV-Vis-NIR absorption spectra of the HIB-adsorbed SWCNT, especially in the NIR region, showed a disappearance of S11 transitions between the V1 valance band and the C1 conduction band of van Hove singularities which can be attributed to the effective charge transfer between HIB and the SWCNT. The Adsorption of HIB also caused significant peak-shifts (lower frequency shift around 170 cm-1 and higher shift around 186 cm‑1) and an intensity change (around 100-150 cm-1 and 270-290 cm-1) in the radial breathing mode of Raman spectra. The charge transfer from SWCNT to HIB was further confirmed by the change in the C1s peak of X-ray photoelectron spectrum, revealing the oxidation of carbon in SWCNT upon HIB Adsorption.
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Electronically modified single wall carbon nanohorns with iodine Adsorption
Chemical Physics Letters, 2011Co-Authors: Fitri Khoerunnisa, Tomonori Ohba, Toshihiko Fujimori, Hirofumi Kanoh, Tsutomu Itoh, Masako Yudasaka, Sumio Iijima, Katsumi KanekoAbstract:Abstract Tailoring electronic properties of single wall carbon nanohorn (SWCNH) is expected to develop the application potential in various fields. SWCNH is efficiently modified with iodine molecules by Liquid Phase Adsorption. The Adsorption isotherm of iodine on SWCNH was Langmuirian with the saturated Adsorption amount of 185 ± 10 mg g−1 (coverage 0.18), indicating a specific interaction between SWCNH and iodine. The DC electrical conductivity of SWCNH film prepared by dip-coating method increased with the iodine Adsorption amount almost by a factor 10.
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assembly structure control of single wall carbon nanotubes with Liquid Phase naphthalene Adsorption
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007Co-Authors: Suzana Gotovac, Hirofumi Kanoh, Lei Song, Katsumi KanekoAbstract:Naphthalene was adsorbed on single wall carbon nanotubes (SWNT) from trichloroethylene solution. The adsorbed state of naphthalene on dry SWNT samples was studied with X-ray photoelectron spectroscopy and Raman spectroscopy. Adsorption of naphthalene molecules on SWNTs in trichloroethylene provide a uniform coating of external surface of individual SWNTs. Also, a technique of the Liquid Phase Adsorption of naphthalene succeeded to control the assembly structure of the SWNTs, leading to an explicit Adsorption hysteresis in the nitrogen Adsorption isotherm at 77 K.
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effect of nanoscale curvature of single walled carbon nanotubes on Adsorption of polycyclic aromatic hydrocarbons
Nano Letters, 2007Co-Authors: Suzana Gotovac, Hirofumi Kanoh, Hiroaki Honda, Yoshiyuki Hattori, Kunimitsu Takahashi, Katsumi KanekoAbstract:Liquid-Phase Adsorption of tetracene and phenanthrene on a single-walled carbon nanotube (SWCNT) was examined. Tetracene Adsorption was more than six times greater than that of phenanthrene. X-ray photoelectron spectroscopic examination clearly showed that tetracene and phenanthrene molecules efficiently coated the SWCNT external surfaces. The remarkable difference between the Adsorption amounts of tetracene and phenanthrene was caused by the nanoscale curvature effect of the tube surface, resulting in a difference in the amount of contact between the molecule and the tube surface. The Adsorption of tetracene and phenanthrene caused a significant higher frequency shift in the radial breathing mode (RBM) of the Raman band of the SWCNT, indicating an intensive π−π interaction between these polycyclic aromatic hydrocarbons and the external SWCNT surface.
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enhancement of the methylene blue Adsorption rate for ultramicroporous carbon fiber by addition of mesopores
Carbon, 2006Co-Authors: Song Lei, Hirofumi Kanoh, Junichi Miyamoto, Yoshitaka Nakahigashi, Katsumi KanekoAbstract:Abstract Predominant mesopores were added to pitch-based activated carbon fiber (0.7 nm of average pore width) by Ca(NO3)2-impregnated chemical activation. The influence of the concentration of calcium nitrate solution, reactivation temperature and reactivation time on the mesopore development of ACF were examined. The development of mesopores in the reactivated ACF was evidenced by an explicit hysteresis of N2 Adsorption isotherm at 77 K. The pore volume ratio of mesopores to micropores reached to 3–4. The addition of predominant mesopores to ACF enhanced the Liquid Phase Adsorption rate of methylene blue by more than 10 times.
Marcus Rose - One of the best experts on this subject based on the ideXlab platform.
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Separation in Biorefineries by Liquid Phase Adsorption: Itaconic Acid as Case Study
ACS Sustainable Chemistry & Engineering, 2016Co-Authors: Kai Schute, Chaline Detoni, Anna Kann, Oliver Jung, Regina Palkovits, Marcus RoseAbstract:In biorefinery processes often the downstream processing is the technological bottleneck for an overall high efficiency. On the basis of recent developments, the selective Liquid Phase Adsorption applying highly hydrophobic porous materials opened up new opportunities for process development. In this contribution, the efficiency of selective Liquid Phase Adsorption is demonstrated for the separation and purification of itaconic acid from aqueous solutions for the first time. A wide range of different adsorbents was screened, revealing the surface polarity as well as textural properties as critical parameters for their performance. Adsorption from mixed solutions of itaconic acid and glucose exhibited extraordinary high selectivities for adsorbents with highly hydrophobic surfaces, especially certain activated carbons and hyper-cross-linked polymers. Evaluation of the pH dependence showed that the respective molecular species of itaconic acid/itaconate has a major impact on the Adsorption performance. Addi...
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metal free and scalable synthesis of porous hyper cross linked polymers towards applications in Liquid Phase Adsorption
Chemsuschem, 2015Co-Authors: Kai Schute, Marcus RoseAbstract:A metal-free route for the synthesis of hyper-cross-linked polymers (HCP) based on Bronsted acids such as trifluoromethanesulfonic acid as well as H2 SO4 is reported. It is an improved method compared to conventional synthesis strategies that use stoichiometric amounts of metal-based Lewis acids such as FeCl3 . The resulting high-performance adsorbents exhibit a permanent porosity with high specific surface areas up to 1842 m(2) g(-1) . Easy scalability of the HCP synthesis is proven on the multi-gram scale. All chemo-physical properties are preserved. Water-vapor Adsorption shows that the resulting materials exhibit an even more pronounced hydrophobicity compared to the conventionally prepared materials. The reduced surface polarity enhances the selectivity in the Liquid-Phase Adsorption of the biogenic platform chemical 5-hydroxymethylfurfural.
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Selective Liquid Phase Adsorption of 5-Hydroxymethylfurfural on Nanoporous Hyper-Cross-Linked Polymers
ACS Sustainable Chemistry & Engineering, 2014Co-Authors: Chaline Detoni, Marcus Rose, Christian Henning Gierlich, Regina PalkovitsAbstract:Hydroxymethylfurfural (HMF) is considered a high potential biogenic platform chemical that can be produced from carbohydrates by hydrothermal or acid-catalyzed dehydration processes. Its separation from polar Liquid Phase reaction mixtures still remains a challenge on the way to commercialization. Recently, Liquid Phase Adsorption of HMF has been considered a viable and energy efficient method. While conventional adsorbents show competitive Adsorption in the reaction mixture, we herein report for the first time the highly selective Adsorption of HMF from aqueous solutions on nanoporous hyper-cross-linked polymers (HCP). Excess Adsorption isotherms of fructose (F), HMF, and its follow-up products levulinic acid and formic acid were measured under equilibrium conditions, and the data were modeled accordingly. Additionally, the desorption behavior was investigated. Overall, the evaluated HCP as well as similar nonpolar adsorbents exhibit great potential for future process development regarding efficient adso...
